Augustus e



(No Model.)

A. E. ELLINWOOD.

CHUCK.

No. 318,970. Patented June 2, 1885.

FDIGJ FIG- 2 lf l FIG 3- W a W llnurnn drn'rns Parent Uri-Finn,

TO LEXVIS FULLER AND HENRY YOUNG, BOTH OF SAME PLACE.

CHUCK.

EBPECIFICATION forming part of Letters Patent Ne. 318,970, dated June 2, 1885.

(No model,

To all whom it may concern.-

Be it known that I, Aucnsrcs E. ELLIN- WOOD, of Akron, county of Summit, and State of Ohio, have invented a new and useful Improvement in Chucks, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, making part of this specification.

My invention relates to an improvement in {O latheohucks, and more particularly to that class in which the clamping-jaws are hinged orpivoted within the inclosing shell and actuated thereby in the manner set forth in an application filed by me on or about December 1,

1883, Serial No. 113,316, and allowed April 15,

My invention consists in a novel manner of pivoting the jaws within the mandrel, where by a positive action is secured and the clamp- Qo ing-jaws rendered more steady in their movements, and in certain details of construction and arrangement of parts hereinafterset forth.

In the accompanying drawings, Figure 1 is a longitudinal sectional view of a chuck with myimprovements applied, showing the clamping jaws or dies in elevation. Fig. 2- is a transverse section through the same, taken on the line as m of Fig. 1. Fig. 3 is a side elevation of the longitudinally-slotted mandrel with one 0 of the clamping-jaws applied, and 4 is a side elevation of one of the clamping-jaws detached.

Like letters denote like parts.

A represents the mandrel of the chuck, and

5 is of hollow cylindrical form, provided with longitudinal slots a a a, as shown. In the drawings the mandrel is shown provided with three of these slots; but two, or more than three, may be employed for the reception of the clamping jaws or dies, if preferred.

B B 13 represent the jaws of the device, being of the form shown in Fig. 4, or of any suitable form. They are provided with inclined outer edges, Z2", for a purpose herein- 5 after stated, and with a recess, 1). for the reception of an angular spring, G, for preserving the position of said jaws and their relation to each other. Each jaw B is provided with projections or pins 1) 1), extending outward from its sides and located centrally which the jaws may rock and be adjusted, according to the form of bit which is inserted between their inner grasping-faces. They may be either formed upon the sides of the jaws or they may be formed by the ends of a short shaft passing through a perforation in the jaw, and either keyed or allowed to remain loose therein, according to the fancy of the manufacturer. Upon these pins or the ends of the shaft, as the case may be, are mounted guiding-blocks b I), in which the pins have their bearings, and are adapted to rock, for a purpose hereinafter set forth. The side walls of the longitudinal slots in the mandrel are grooved or have square recesses a a about midway of their length, corresponding in size with and adapted to receive and guide the square bearing-blocks Z) on the pins b in their radial movements, whether toward or away from the center of the mandrel. The bearingblock b is madeslightly smaller than the guideway a, for the purpose of allowing the said block to slide freely therein without binding. Thus it will be seen that the clamping-jaws B- maybe rocked freely upon their pivots in the blocks b for adjusting them to the form of bit used, while at the same time the blocks themselves are adjustable radially for adapting the jaws to any size or diameter of bit.

The arrangement of the other parts of the chuck and the manner of actuating and adjusting the clamping-jaws now remains to be described. A threaded collar, D, surrounds the mandrel A, fitting closely, but loosely, 8 5 thereon. At its inner end it is provided with a flanged portion, D, through which a retaining-screw, d, passes into one of the slots in the mandrel, preventing any revolution or turningof the said collar D upon the mandrel, and 0 at the same time allowing it to slide or be ad j usted longitudinally upon the mandrel. The inner face of the collar D is made flaring at d, for the purpose of acting upon the inner inclined faces or edges, 1), of the clamping-jaws for depressing the latter or causing them to approach the center of the mandrel for acting upon the bit.

Surrounding the mandrel A, and also the collar D, is an outer shell or collar, E, provided with an internal thread, 6, correspondthereof. These pins serve as pivots, upon ing to and engaging with the threaded external face, d of the inner collar, D. The outer edges of the collar E converge toward the mandrel, forming an inclined surface within the end of the said collar, which acts upon the inclined faces I) of the clamping-jaws. It will thus be seen that as the outer collar or shell is turned upon the inner collar their inner i11- clined faces will be caused to approach each other, and will operate upon the jaws B to simultaneously force them all inward radially until they clamp or grasp the bit between them. The spring 0 is angular inform, when in its normal position, and operates to force the jaws apart when they are not acted upon by theadjusting-collars for permitting the introduction of the bit, and is secured to the said jaws by screws 0, or in any usual manner.

Having now described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. The clamping-jaws of a chuck or toolholder, pivoted within radially adjustable bearing-blocks, substantially as and for the purpose described.

. 2. The elampingjaws of a chuck or tool- 25 holder, pivoted within sliding bearing-blocks adjustable radially in the slots of the mandrel, substantially as specified.

3. The clamping-jaws of a chuck or toolh'older, pivoted within radially adjustable 30 blocks, in combination with means for adjusting the jaws, substantially as described.

4. The combination, with the'mandrlel, of the radially-moving jaws pivoted within the sliding adjustable blocks working therein, and 1 5 the inner longitudinally-adjustable collar and i the outer covering shell or collar, both provided with intermeshingscrew-threads, and internal inclined faces for acting upon the inclined edges of the radially-moving elampingo jaws for adjusting the latter, substantially as and for the purpose specified.

In testimony whereof I havehereunto set my hand this 12th day of May, A. D. 1884.

AUGUSTUS E. ELLINNVOOD.

\Vitnesses:

O. L. SADLER, E. B. MILLER. 

